dt-bindings: clk: Update Stingray binding doc

Update Stingray clock binding document to add additional clock entries
with names matching the latest ASIC datasheet. Also modify a few existing
entries to make their naming more consistent with the rest of the entries

Signed-off-by: Pramod Kumar <pramod.kumar@broadcom.com>
Signed-off-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>